SCP 06F6

SCP 06F6 is a very unusual object discovered in 2006 by the Hubble Space Telescope.  Its spectrum and light curve are unlike any other known. Initial observations weren't able to identify any of the typical spectral lines. The Palomar Transient Factory was able to determine its redshift (z = 1.189) and that its luminosity is one of the highest currently known:  Mysterious transients unmasked as the bright blue death throes of massive stars.